succesive surveys

Dear Limesurvey experts,
for my PHD I'm planning a study, where participants have to fill out one survey per week in a six week period. My question is the following:
Do I have to invite participants to the survey each week manually or is it possible to send invitations automatically?

Also I wonder, if I could import a survey that was created at the platform unipark? Sadly the only export data file available is a gpx file so until now I was not able to import it.

I am quite sure that you can not import a survey from Unipark. The guys from Globalpark (now Questback) are probably not very interested in that. It would be great if there would be some standard format for surveys, but I think that will probably never happen.

I assume that they need to fill out different surveys each week? Or is it the same survey each week?

The sending of the invitations needs to be triggered manually. But come on, for a PHD it is not too much work to trigger the invitations each week...